One or two on the list are non-native, simply because their nectar production was so good. Admittedly I've been relatively blasé when it comes to native vs non-native. My only requirements were that bees like it and it can grow in the hard, clay-like soil in my garden. I've had no issues with the native plants getting blocked out by the non-native, but I will keep an eye on it and remove any foreign guests that seem to be taking my hospitality too generously.